Date: Sat, 14 Aug 1999 22:07:29 +1000 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, freebsd-fs@FreeBSD.ORG Subject: Re: better ffs-4096-512 ... ext2fs-4096-4096 benchmarks Message-ID: <199908141207.WAA02286@godzilla.zeta.org.au>
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>The results are as I expected, except reading ext2fs-4096-4096 is now
>about 2.5 times faster than for the best ffs layout. The throughput of
Actually, there are some much more surprising results:
>ffs-4096-512:
>fsck /dev/rwd2e: 12.56 real 2.59 user 0.18 sys
>tarcp /d ncvs: 1509.69 real 4.76 user 74.37 sys
^^^^^
>umount /d: 2.00 real 0.00 user 0.29 sys
>fsck /dev/rwd2e: 52.68 real 3.24 user 0.93 sys
>tar cf /dev/null ncvs: 364.42 real 1.73 user 22.31 sys
^^^^^
The critical system times are about 70 and 20 seconds for ffs-4096-any.
>ffs-8192-1024:
>fsck /dev/rwd2e: 5.93 real 1.27 user 0.13 sys
>tarcp /d ncvs: 1444.24 real 5.07 user 148.23 sys
^^^^^
>umount /d: 0.51 real 0.00 user 0.30 sys
>fsck /dev/rwd2e: 38.46 real 1.93 user 0.84 sys
>tar cf /dev/null ncvs: 348.17 real 1.84 user 46.74 sys
^^^^^
The critical system times are almost twice as large for ffs-8192-most.
They should be smaller.
>ffs-8192-4096:
>fsck /dev/rwd2e: 2.68 real 0.52 user 0.05 sys
>tarcp /d ncvs: 1379.23 real 5.41 user 123.14 sys
>umount /d: 1.13 real 0.00 user 0.31 sys
>fsck /dev/rwd2e: 34.02 real 1.14 user 0.70 sys
>tar cf /dev/null ncvs: 260.32 real 1.59 user 20.33 sys
^^^^^
Here's one reasonable system time for ffs-8192-*.
`tar cf /dev/null' of the original /home/ncvs takes 828.85 real, 1.89 user,
21.90 sys, so it accounts for about half of the real times for tarcp but
not much of the system times.
Bruce
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